More and more regions are now opening up the possibility of booking a third vaccine dose against covid-19.

On Monday, the general booking opened for those born in 1941 or earlier in the Stockholm region.

- For the fragile and elderly, it is very important to get started.

Professor Matti Sällberg says that there must be at least six months between the second and third dose of vaccine.

- There have been several studies that show that immunity is waning.

It still seems to be a very good protection against serious illness and death, even if you can get a little infected after more than six months after undergoing vaccination.

Will vaccines become ineffective?

- They do not become completely ineffective.

Can they be vaccinated with a fourth and fifth dose?

- Absolutely.

For the elderly, this will be similar to how we deal with the flu.

They will probably receive a dose at least every twelve months.